191080387 has 2 divisors, whose sum is σ = 191080388. Its totient is φ = 191080386.

The previous prime is 191080369. The next prime is 191080441. The reversal of 191080387 is 783080191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191080387 - 2⁷ = 191080259 is a prime.

It is not a weakly prime, because it can be changed into another prime (191080367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95540193 + 95540194.

It is an arithmetic number, because the mean of its divisors is an integer number (95540194).

Almost surely, 2^191080387 is an apocalyptic number.

191080387 is a deficient number, since it is larger than the sum of its proper divisors (1).

191080387 is an equidigital number, since it uses as much as digits as its factorization.

191080387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 191080387 is about 13823.1829547322. The cubic root of 191080387 is about 575.9773040745.

The spelling of 191080387 in words is "one hundred ninety-one million, eighty thousand, three hundred eighty-seven".